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Note 3 - Loans Receivable (Details) - Impaired Loans - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Construction loans:    
Loans with an related allowance, recorded investment $ 7,683,000 $ 7,710,000
Loans with an related allowance, unpaid principal balance 7,859,000 7,886,000
Loans with an related allowance, average balance total loans 7,706,000 7,890,000
Loans with an related allowance, interest income recognized 79 304
Construction loans:    
Loans with no related allowance, recorded investment 124,000 127,000
Loans with no related allowance, unpaid principal balance 124,000 127,000
Related Allowance 17 17
Loans with no related allowance, average balance total loans 127,000 135,000
Real Estate Portfolio Segment [Member] | Residential [Member]    
Construction loans:    
Loans with an related allowance, recorded investment 195,000 247,000
Loans with an related allowance, unpaid principal balance 195,000 247,000
Loans with an related allowance, average balance total loans 213,000 255,000
Loans with an related allowance, interest income recognized 5 13
Real Estate Portfolio Segment [Member] | Commercial [Member}    
Construction loans:    
Loans with an related allowance, recorded investment 7,476,000 7,451,000
Loans with an related allowance, unpaid principal balance 7,652,000 7,627,000
Loans with an related allowance, average balance total loans 7,481,000 7,623,000
Loans with an related allowance, interest income recognized 74 291
Construction loans:    
Loans with no related allowance, recorded investment 124,000 127,000
Loans with no related allowance, unpaid principal balance 124,000 127,000
Related Allowance 17 17
Loans with no related allowance, average balance total loans 127,000 135,000
Commercial, Industrial and Agricultural Portfolio Segment [Member]    
Construction loans:    
Loans with an related allowance, recorded investment 12,000 12,000
Loans with an related allowance, unpaid principal balance 12,000 12,000
Loans with an related allowance, average balance total loans $ 12,000 $ 12,000